Journal of Petroleum Science & Engineering2022，Vol.21215.DOI:10.1016/j.petrol.2022.110268

Developing a saturation-height function for reservoir rock types and comparing the results with the well log-derived water saturation, a case study from the Fahliyan formation, Dorood oilfield, Southwest of Iran

Esmaeili, Behnam Rahimpour-Bonab, Hossein Kadkhodaie, Ali Ahmadi, Amir Hosseinzadeh, Sirous
Journal of Petroleum Science & Engineering2022，Vol.21215.DOI:10.1016/j.petrol.2022.110268
✕
  • NSTL
  • Elsevier

Developing a saturation-height function for reservoir rock types and comparing the results with the well log-derived water saturation, a case study from the Fahliyan formation, Dorood oilfield, Southwest of Iran

Esmaeili, Behnam 1Rahimpour-Bonab, Hossein 1Kadkhodaie, Ali 2Ahmadi, Amir 3Hosseinzadeh, Sirous4
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作者信息

  • 1. Univ Tehran
  • 2. Univ Tabriz
  • 3. Iranian Offshore Oil Co IOOC
  • 4. Kharazmi Univ
  • 折叠

Abstract

Determining the potential of reservoirs and production zones is very important to reach maximum product performance and decrease hydrocarbon recovery costs. The calculation of the Water Saturation (S-W) significantly affects oil-in-place estimations. The Saturation-Height Function (SHF) is operated to predict the saturation in the reservoir for a given height above the free water level. Typical approaches for predicting water saturation as a function of rock properties and height above contact include two types, those based on capillary pressure curve averaging and log-based techniques. The goal of this study is to define an appropriate SHF and S-W using the usual functions to delineate production zones using rock typing with an example from the Dorood oilfield in the Persian Gulf. In this study first, the reservoir has been divided into different rock types and water saturation is estimated by different methods in each rock type. The Reservoir Quality Index (RQI) along with Water Saturation profile for representative rock types were used for determining reservoir zones. Accordingly, a formulation was developed to model the behavior of Capillary Pressure (P-C) as a characteristic of S-W and to determine the Free Water Level (FWL) based on laboratory data. To achieve this goal, the appropriate saturation-height functions and their coefficients were chosen for representative reservoir rock types. The Pc curves are classified based on Discrete Rock Types (DRT) and a proper saturation-height function was assigned for individual rock types. Finally, some of the most common equations for calculating SHF were fitted to the representative Pc curve of each rock type and coefficients of the equation for any rock type were determined by using the MATLAB software in the studied carbonate reservoir. After investigating the results of fitting different SHF, water saturation was calculated using a modified lambda function and compared with the log-derived water saturation. The SHF applied, could be used to estimate saturations of unreachable zones of the field.

Key words

Water saturation/Saturation height function/Rock typing/Carbonate reservoirs/Mercury injection data (MICP)/CAPILLARY-PRESSURE/GULF/FACIES/MODEL

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出版年

2022
Journal of Petroleum Science & Engineering

Journal of Petroleum Science & Engineering

ISSN：0920-4105
被引量5
参考文献量59
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